#!/usr/bin/env python3
"""A setuptools based setup module.

See:
https://packaging.python.org/en/latest/distributing.html
https://github.com/pypa/sampleproject

Extra supported commands are:
* gen, to generate the classes required for Telethon to run or docs
* pypi, to generate sdist, bdist_wheel, and push to PyPi
"""

import itertools
import json
import re
import shutil
from os import chdir
from pathlib import Path
from subprocess import run
from sys import argv

from setuptools import find_packages, setup


class TempWorkDir:
    """Switches the working directory to be the one on which this file lives,
       while within the 'with' block.
    """
    def __init__(self):
        self.original = None

    def __enter__(self):
        self.original = Path('.')
        chdir(str(Path(__file__).parent))
        return self

    def __exit__(self, *args):
        chdir(str(self.original))


GENERATOR_DIR = Path('telethon_generator')
LIBRARY_DIR = Path('telethon')

ERRORS_IN = GENERATOR_DIR / 'data/errors.csv'
ERRORS_OUT = LIBRARY_DIR / 'errors/rpcerrorlist.py'

METHODS_IN = GENERATOR_DIR / 'data/methods.csv'

TLOBJECT_IN_TLS = [Path(x) for x in GENERATOR_DIR.glob('data/*.tl')]
TLOBJECT_OUT = LIBRARY_DIR / 'tl'
IMPORT_DEPTH = 2

DOCS_IN_RES = GENERATOR_DIR / 'data/html'
DOCS_OUT = Path('docs')


def generate(which, action='gen'):
    from telethon_generator.parsers import\
        parse_errors, parse_methods, parse_tl, find_layer

    from telethon_generator.generators import\
        generate_errors, generate_tlobjects, generate_docs, clean_tlobjects

    layer = next(filter(None, map(find_layer, TLOBJECT_IN_TLS)))
    errors = list(parse_errors(ERRORS_IN))
    methods = list(parse_methods(METHODS_IN, {e.str_code: e for e in errors}))

    tlobjects = list(itertools.chain(*(
        parse_tl(file, layer, methods) for file in TLOBJECT_IN_TLS)))

    if not which:
        which.extend(('tl', 'errors'))

    clean = action == 'clean'
    action = 'Cleaning' if clean else 'Generating'

    if 'all' in which:
        which.remove('all')
        for x in ('tl', 'errors', 'docs'):
            if x not in which:
                which.append(x)

    if 'tl' in which:
        which.remove('tl')
        print(action, 'TLObjects...')
        if clean:
            clean_tlobjects(TLOBJECT_OUT)
        else:
            generate_tlobjects(tlobjects, layer, IMPORT_DEPTH, TLOBJECT_OUT)

    if 'errors' in which:
        which.remove('errors')
        print(action, 'RPCErrors...')
        if clean:
            if ERRORS_OUT.is_file():
                ERRORS_OUT.unlink()
        else:
            with ERRORS_OUT.open('w') as file:
                generate_errors(errors, file)

    if 'docs' in which:
        which.remove('docs')
        print(action, 'documentation...')
        if clean:
            if DOCS_OUT.is_dir():
                shutil.rmtree(str(DOCS_OUT))
        else:
            generate_docs(tlobjects, methods, layer, DOCS_IN_RES, DOCS_OUT)

    if 'json' in which:
        which.remove('json')
        print(action, 'JSON schema...')
        json_files = [x.with_suffix('.json') for x in TLOBJECT_IN_TLS]
        if clean:
            for file in json_files:
                if file.is_file():
                    file.unlink()
        else:
            def gen_json(fin, fout):
                meths = []
                constructors = []
                for tl in parse_tl(fin, layer):
                    if tl.is_function:
                        meths.append(tl.to_dict())
                    else:
                        constructors.append(tl.to_dict())
                what = {'constructors': constructors, 'methods': meths}
                with open(fout, 'w') as f:
                    json.dump(what, f, indent=2)

            for fs in zip(TLOBJECT_IN_TLS, json_files):
                gen_json(*fs)

    if which:
        print('The following items were not understood:', which)
        print('  Consider using only "tl", "errors" and/or "docs".')
        print('  Using only "clean" will clean them. "all" to act on all.')
        print('  For instance "gen tl errors".')


def main():
    if len(argv) >= 2 and argv[1] in ('gen', 'clean'):
        generate(argv[2:], argv[1])

    elif len(argv) >= 2 and argv[1] == 'pypi':
        # (Re)generate the code to make sure we don't push without it
        generate(['tl', 'errors'])

        # Try importing the telethon module to assert it has no errors
        try:
            import telethon
        except:
            print('Packaging for PyPi aborted, importing the module failed.')
            return

        for x in ('build', 'dist', 'Telethon.egg-info'):
            shutil.rmtree(x, ignore_errors=True)
        run('python3 setup.py sdist', shell=True)
        run('python3 setup.py bdist_wheel', shell=True)
        run('twine upload dist/*', shell=True)
        for x in ('build', 'dist', 'Telethon.egg-info'):
            shutil.rmtree(x, ignore_errors=True)

    else:
        # e.g. install from GitHub
        if GENERATOR_DIR.is_dir():
            generate(['tl', 'errors'])

        # Get the long description from the README file
        with open('README.rst', 'r', encoding='utf-8') as f:
            long_description = f.read()

        with open('telethon/version.py', 'r', encoding='utf-8') as f:
            version = re.search(r"^__version__\s*=\s*'(.*)'.*$",
                                f.read(), flags=re.MULTILINE).group(1)
        setup(
            name='Telethon',
            version=version,
            description="Full-featured Telegram client library for Python 3",
            long_description=long_description,

            url='https://github.com/LonamiWebs/Telethon',
            download_url='https://github.com/LonamiWebs/Telethon/releases',

            author='Lonami Exo',
            author_email='totufals@hotmail.com',

            license='MIT',

            # See https://stackoverflow.com/a/40300957/4759433
            # -> https://www.python.org/dev/peps/pep-0345/#requires-python
            # -> http://setuptools.readthedocs.io/en/latest/setuptools.html
            python_requires='>=3.5',

            # See https://pypi.python.org/pypi?%3Aaction=list_classifiers
            classifiers=[
                #   3 - Alpha
                #   4 - Beta
                #   5 - Production/Stable
                'Development Status :: 5 - Production/Stable',

                'Intended Audience :: Developers',
                'Topic :: Communications :: Chat',

                'License :: OSI Approved :: MIT License',

                'Programming Language :: Python :: 3',
                'Programming Language :: Python :: 3.5',
                'Programming Language :: Python :: 3.6'
            ],
            keywords='telegram api chat client library messaging mtproto',
            packages=find_packages(exclude=[
                'telethon_*', 'run_tests.py', 'try_telethon.py'
            ]),
            install_requires=['pyaes', 'rsa'],
            extras_require={
                'cryptg': ['cryptg']
            }
        )


if __name__ == '__main__':
    with TempWorkDir():  # Could just use a try/finally but this is + reusable
        main()
